Gall. Irregularly fusiform, presumably stem gall, light green when fresh, fleshy, quite firm, polythalamous, the interior fibrous and inhabited by a number of larvae; length, 1.5 to 2.5 cm.; diameter, 1 to 1.5 cm.

- EP Felt: (1916) New North American gall midges^©

Reference: https://www.biodiversitylibrary.org/page/2561018#page/499/mode/1up